CAR

Ultra Precision Metal Film Resistors CAR series Welwyn Components • Tolerance down to 0.01% • Low TCR’s • High reliability • Superior moisture performance • Non standard values available • Highest stability metal film available • Matched sets and networks Electrical Data CAR5 Power rating at 70°C Power rating at 85°C Resistance range Limiting element voltage TCR (20 to +70°C) Resistance tolerance Standard values Thermal impedance Ambient temperature range °C/watt °C 110 watts watts ohms volts ppm/°C % 0.25 0.125 10R0 to 3M 250 CAR6 0.33 0.25 10R0 to 5M 350 CAR7 0.5 0.33 10R0 to 10M 500 See tolerance/TCR combinations below 60 Notes 5(V), 10(T), 15(Y), 25(D), 50(C) 0.01(L), 0.02(P), 0.05(W), 0.1(B), 0.25(C), 0.5(D) & 1(F) E24, E96 preferred 70 -55 to +155 Table of Resistance Restrictions Tolerance TCR ppm/°C 0.01-0.02% 5 10 15 25 50 50 to 300k 50 to 300k 50 to 300k 50 to 300k 50 to 300k CAR5 0.05% 10 to 500k 10 to 1M 10 to 1M 10 to 1M 10 to 1M 0.1-1% 10 to 500k 10 to 1M 10 to 1M 10 to 1.5M 10 to 3M 0.01/0.02% 50 to 500k 50 to 500k 50 to 500k 50 to 500k 50 to 500k CAR6 0.05% 10 to 500k 10 to 1M 10 to 1M 10 to 1M 10 to 1M 0.1-1% 10 to 500k 10 to 1M 10 to 1M 10 to 3M 10 to 5M 0.01-0.02% 50 to 750k 50 to 750k 50 to 750k 50 to 750k 50 to 750k CAR7 0.05% 10 to 750k 10 to 1M 10 to 1M 10 to 1M 10 to 1M 0.1-1% 10 to 750k 10 to 1.5M 10 to 3.5M 10 to 5M 10 to 10M Physical Data Dimensions (mm) and Weight (g) PCB mounting Type CAR5 CAR6 CAR7 L Max 7.2 10.0 15.5 D Max 2.5 3.7 5.5 f min 30 30 30 d nom. 0.6 0.6 0.8 centres 10.2 12.7 18.4 Min Bend Radius 0.6 0.6 1.2 Wt. nom. 0.24 0.40 1.15 d D L f General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn’s own data and is considered accurate at time of going to print. A subsidiary of TT electronics plc Issue B · 03.02 © Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com 178 Ultra Precision Metal Film Resistors CAR series Marking Type reference, TCR code, resistance value and tolerance code. The resistance value marking conforms to IEC 62. Welwyn Components Construction Ceramic rods are coated with a metal film and plated steel caps are force fitted. A helical cut is used to adjust the film to its final value. Termination wires are welded to the caps and the resistor is protected with a specially formulated epoxy coating. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning fluids suitable for printed circuits. Terminations Material Strength Solderability Solder-coated copper wire. The terminations meet the requirements of IEC 68.2.21 The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2 Performance Data Values 10 ≤ 250k Actual Performance Maximum Load at rated power : 1000 hrs at 70°C (or 85°C) Dry heat : 1000 hrs at 155°C Shelf life : 12 months at room temperature Derating from rated power at 70°C (or 85°C) Short term overload Climatic Climatic category Long term damp heat Temperature rapid change Resistance to solder heat Vibration and bump Noise (in a decade of frequency) Voltage coefficient of resistance ∆R % ∆R % ∆R % ∆R % µV/V ppm/V 0.05 0.04 0.02 0.02 0.2 0.3 ∆R % ∆R % ∆R % ∆R % ∆R % 0.05 0.15 0.01 0.01 0.05 55/155/56 0.02 0.02 0.003 0.002 0.03 250k Actual Performance Maximum 0.25 1 0.04 0.08 0.2 55/155/56 0.05 0.05 0.005 0.02 0.1